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remove xhat
The xhat infrastructure was added to support hardware such as the zulu
graphics card - hardware which had on-board MMUs. The VM used the xhat code
to keep the CPU's and Zulu's page tables in-sync. Since the only xhat user
was zulu (which is gone), we can safely remove it simplifying the whole VM
subsystem.
Assorted notes:
- AS_BUSY flag was used solely by xhat
*** 79,89 ****
CORE_OBJS += promif_version.o
CORE_OBJS += sfmmu_kdi.o
CORE_OBJS += suspend.o
CORE_OBJS += swtch.o
CORE_OBJS += wdt.o
- CORE_OBJS += xhat_sfmmu.o
CORE_OBJS += mdesc_diff.o
CORE_OBJS += mdesc_findname.o
CORE_OBJS += mdesc_findnodeprop.o
CORE_OBJS += mdesc_fini.o
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